To william smith hall



MOSES lG. CRAE, 0F NE'WTONr AND A.. M. POLSEY, 0F BOSTON ASSIGNORS T0WILLIAM SMITH HALL, 0F QUINCY, MASSACHUSETTS.

Letters .Potent N 99,761, cla-ted February 1,5, 1870.

The Schedule referred to in these Letters Patent and making part of thename To all whom it may concern:

Be it known thatwe, MOSES G. CRANE, of Newton,l

folk county, all in the State of Massachusetts, have.

invented nn Improvement in Friction-Fowl Mechanism; :md we do herebydeclare thatthe' following, 4taken in connection with the drawingswhichaccom 'pziny and l'orm parl; of this specification, is e description ofour invention, suicient to enable those skilled Yin the nrt to practiseit.

In United States Letters Patent, Nos. 86,833nnd 91,- 123, gronted toWiLLIAlo Smm HALL, there isshown a driving wheel actuated byfriction-howl or griping mechanism of peculiar organization, the flangeof the wheel being griped by and between two pins of the pawl lever whenthe lever is thrown in one direction, but assuming such a position thatthe wheel-Bange runs fleely and loosely between them when the newllevris ntrest or is driven in the opposite direction.

In the use of this impelling friction mechanism, it is found that thestress of' the wheehige noon the .pins orvof the p ins nnen theflnngmlsomeitnes cznlseL then: to get loose or to wear nnevenly, and sothat they do not press npon the whcell'liunge over the whole length oftheir noting suri'ztcesf ih consequence of which they sometimes l'nil togripe the wheel-things at the proper time, and slip over it instead ofimporting motion to it. y f In building HALUS lrendlednechanisms forhim, we have devised the im norement constituting the present invention,in which we hztvesought to remedy the diicnlties attending the nse 'ofthe grilling pins, our invention being made for and assigned to snidlinnn. In our invention, insiemi ol' using the pins, ne use twoswiveling keys, setting in slots extending from the opposite sides ol'the groove in which the wheelinnge runs, the griping edges ol' thesekeys nce-ommodziting themselves to the opposite snritcos ol' thowhechilunge, and thereby hugging to the wheel nloncgv the whole lengthof ench. To connu-:mitte for wcm', we combine with one of the keys unAdjust-ing screw or its equivalent, against which the hey rests and uponwhich it. swivels, thc key being kept nlwnys in proper position withrelation tothe llnge by forcing it op, as il: wenrs, by the screw.

It is in the combination with the pnwi lever or .fn-rn of theseswivcling keys, that our invention consists, as'also in the provisionfor adjustment of the keys to compensate for wem'.

The drawings showihat. part of the-wheeldriving mechanism directlyembodying our improvements.

A shows an inner side View ofthe pewl lever and griping mechanism.

B is :t section of the line x r.

C, n section of the line y y.

The contraction of the pnwl lever and frictionclutch or grillingmechanism with the trendle mechanism will be readily understood from thecorrespondence bctween the View A of the accompanying drawing and theView C of the said BALL patent Fo. 86,833, and the detail View shown insaid HALL patent No. 9l,l 3, the letter View and the view A of theaccompanying drawings being the sinne, with the exception of the changein the wheel-driving device, sc that for convenience of reference, thesame letters will he used now as were used for corresponding parts inthe thawing of said potent No. 91,123.

-r denotes 'the pnwl lever, fulcrnmed :it fn, and hov-A ing pivoter] ntits lower end, (as seen at t,) the paw]- carrying arm s, this arm beingthrown into normal position, as seen :it A, by :t spring, n, and cominginto line with the pnwl lever when the lever moves npward. Instead ofthetwo pins j j, shownin such patent No. 91,123, we use the two keys orpowls jj seen in the accompanying drawings; the pztwls itting into slotsa a, cnt into the arm on opposite sides ein cross slot or niortise, b,ont into the nrm'as seen in the (imirings, the tlztngep of the wheel tobedrircn rimuing in this mortise.

1o. the innerend of. each key j is a. notch, c, and across one or eachslot; a. pin, d, extends, the key notch strnddling this pin, so that thekey cnn swivel slightly upon it'.- The keys nrc prefere-bly mode ofSteel, and, ns cnch one swivels, it will readily be seen that thc wholelength of the flange-abutting edge of each will bear equally upon theflange, even thongh such edge may weer nneqnnlly nl: its opposite ends.

The outer key is shown :is resting upon the point oi' n screw pin, c,swivcling npon this point, the snmc :is the other key swivels upon thepin d. By turning np thc screw, the key will he fed toward the oppositekey, rims cnnhling them to be :it nll times kept at .snitnhlc distanceapart, to properly gripe the wheel flange.

lt will he obvious that either or both keys may be rmilily slipped ont`und replaced by new ones when worn. lhoy operate to impl-l the wheelwhen moved in one direction and :lllow the wheel to slip through themwhen moved in the opposite direction, in pre risely the some generalnimmer os the pins operate in the .HALL patents referred to. Y

We clnimin combination with the pewl arm, thegriping keys jj,snhstnntinlly as described.

Also, the nrrnngemcnt of the keys lo swivel, sub stnntnlly as de rihcd.

Also, in combination with the keys, n screw or its equivalent, forrelative adjustment of them, substan- Iinlly as described.

Executed December 14, 1869.

MOSES GLGRANE. A. M. POLSEY.

Witnesses:

J. B. Unosnv, FnANCls Geom).

